Penelope Mortimer was a prominent British screenwriter whose work in the 1970s left a lasting impact on film enthusiasts and collectors alike. Her most notable film, *Three's One* (1973), showcases her sharp wit and keen insight into human relationships, making it a standout title in the world of vintage cinema. This film not only epitomizes the era's exploration of complex narratives but also serves as a prime example of Mortimer's ability to blend humor with poignant commentary, a quality that resonates with collectors searching for depth in their collections. Collectors particularly seek out Mortimer's work due to its rarity and the cultural significance it holds. The limited releases of *Three's One* on various home media formats, including DVD and Blu-ray, often feature exclusive extras that highlight her creative process and influence. As a figure whose films encapsulate a unique moment in film history, Mortimer remains a beloved name among those who appreciate the art of storytelling in physical media.